MSD84891 Pro-Billet Flat-Top Chevy Distributor Having a huge huffer mounted on top of your engine is cool, but can lead to limited choices for a distributor. Same goes for tri-power carb setups and big air cleaner assemblies, so we decided to morph our Crab Cap crank trigger distributor with a standard Chevy model to come up with the Flat-Top! This distributor sits low in the engine block, then is topped with our special Crab Cap that positions the spark plug terminals horizontally to give you plenty of clearance. The distributor incorporates a mechanical advance assembly that you can easily tune with the supplied springs and stop bushings. For trigger accuracy, a maintenance-free magnetic pickup is used. This pickup plugs directly into an MSD Ignition Control. The Flat-Top Distributor is supplied with our Dupont, Rynite molded distributor cap and rotor along with a heavy duty gear for long life in your engine.